Darby is a Democratic stronghold. About 90% of voters here vote Democratic and 10% Republican.
About 63% of adults in Darby typically vote, near the U.S. average of about 62%. Among adults in Darby, ~57% vote Democratic, ~6% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How Darby compares
Among cities within 25 miles, Darby leans more Democratic than 256 of 259 neighbors.
Darby runs about 82 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and Darby sits clearly on the Democratic side.
Why Darby leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Darby, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 97% of residents in Darby live in densely developed areas, about 61 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 53% of adults in Darby have never been married, above 98% of cities. Darby runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Darby, PA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Darby looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Darby is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 44%, about 20 points below the Pennsylvania average of 64%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Colwyn, PA D+76
- Yeadon, PA D+86
- Collingdale, PA D+52
- Sharon Hill, PA D+75
- Aldan, PA D+40
- East Lansdowne, PA D+68
- Lansdowne, PA D+68
- Primos, PA D+21
- Glenolden, PA D+11
- Clifton Heights, PA D+19
Cities with Similar Populations
- Bunker Hill, WV R+42
- Miles City, MT R+39
- Craig, CO R+49
- Tamaqua, PA R+38
- Hornell, NY R+27
- Woodmoor, CO R+25
- Orosi, CA D+10
- Abingdon, MD D+8
- Campobello, SC R+65
- West Frankfort, IL R+50
Sources and methodology
Precinct-level voting records used to fit the model come from Pennsylvania Department of State, Bureau of Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.